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Development of Low-Water Crossing Design Guidelines for Very Low ADT Routes in Illinois
| 题名： | Development of Low-Water Crossing Design Guidelines for Very Low ADT Routes in Illinois |
| 作者： | Bhattarai, R.; Kalita, P.; Gautam, S.; Howard, H.; Svendsen, N.; Gambill, D. |
| 关键词： | Illinois (state)##Low-water crossings##Design guidelines##Improvements##Recommendations##Evaluation##Implementation##Development##Requirements analysis##Aging bridges##Culverts(Structures)##Best management practices##Maintenance costs##Illinois Department of Transportation (IDOT)## |
| 摘要： | The Illinois Department of Transportation (IDOT) and local agencies monitor and regulate the 146,764 mi of roadway that are open to public travel in the State of Illinois. There are many old and aging bridges, culverts, and low-water crossings on rural low-volume roads that need to be replaced. Low-water crossings (LWCs) have been used as an economical alternative to culverts and bridges, designed without overtopping, on low-volume roads where there is low number of floods. The lack of design guidance has posed difficulty for county engineers in Illinois in deciding when, where, and which type of low-water crossing to use. The resulting structure is often either overdesigned or underdesigned. A study was conducted to design the guidelines for LWCs in Illinois at the University of Illinois at Urban-Champaign in collaboration with the U.S. Army Corps of Engineers - Construction Engineering Research Laboratory (CERL) and support from the IDOT. The study included a literature review, an LWC survey, and case studies on LWCs in Illinois. The results from a survey conducted among the county engineers in Illinois about their experience with LWCs are presented, along with commonly used LWCs, site considerations, selection criteria, and signage requirements. Design criteria and procedure for the LWCs design, construction, and best management practices are also discussed. Additionally, case studies, design examples, and permitting requirements for LWCs are included in the report. Implementation of LWC guidelines could save local agencies significant funding, due to lower construction and maintenance costs, less channel and flood plain blockage, and better adaptability and storm-proofing characteristics, as well as reduced impacts to aquatic organism passage. |
| 总页数： | 151 |
| 报告类型： | 科技报告 |
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